# Adding an extra cost to your option
If you want an option to increase the product price, click the **price tag icon** inside your Option Set.
This feature is called **Native Bundling**.
Native Bundling works by connecting your option value to a Shopify product that has a price. \
When a shopper selects the option, Shopify adds that product behind the scenes and updates the order total.
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### Why This Works
Shopify can only charge money through products. When someone selects a paid option, Infinite Options can use a hidden product with a price to the cart. Customers won’t see this product on its own — it simply allows Shopify to increase the total.
### Step 1: Create (or Use) an Add-On Product in Shopify
Native Bundling requires one Shopify product to hold the price you want to charge.
You can:
* Use an existing add-on product
* Or create a new one
This product:
* Must be **active**
* Does **not** need to be assigned to the Online Store sales channel
* Does **not** need to be visible on your storefront
Customers will not see this product on its own. Its only purpose is to store the added cost.
{% hint style="success" %}
**Optional:**\
If you want to track inventory for the add-on, enable inventory tracking for this product.
{% endhint %}
### Step 2: Add the Cost to Your Option
1. Open your Option Set
2. Hover over an option value
3. Click the **price tag icon** next to the value
A pop-up will appear. Search for and select the add-on product (or variant) you created in Step 1.
* Enter the amount you want to charge in the price field
* Click **Add**
* Click **Save Changes** at the top right of the page
That’s it.
When the option is selected, Shopify will automatically add the cost to the order.
### Looking for the price tag icon on a text field?
Text and Large Text fields use a different setup.
{% hint style="success" %}
Follow this guide: [**Up-Charge Pricing and Text Box**](https://shoppad.gitbook.io/infinite-options/popular-setups/up-charge-pricing-and-text-box) — how to charge for text fields
{% endhint %}
## Watch: How Native Bundling Works
If you prefer to see this process in action, watch the walkthrough here:
{% embed url="" %}
## Show the Updated Price on the Product Page
Shopify themes control how prices are displayed.
If you want the product price to update automatically when an option adds a cost, add the [**Dynamic Bundle Price**](#add-the-dynamic-bundle-price-block) block to your product template.
This block replaces your theme’s default price display and updates the total as shoppers select options.
### Add the Dynamic Bundle Price Block
1. In Shopify, go to **Online Store → Themes**
2. Click **Customize**
3. In the top dropdown, select **Products**
4. Open your product template
5. In the left sidebar, hide or remove the default **Price** block
6. Click **Add block**
7. Select **Dynamic Bundle Price**
8. Adjust styling if needed
9. Click **Save**
Your product page will now update the displayed total as shoppers select options that add a cost.
## Common Questions
Do customers see the add-on product?
No. The product must be **active**, but it does not need the Online Store sales channel.
Without that sales channel, it remains hidden from your storefront.
Can I track inventory?
Yes. Because Native Bundling uses a real Shopify product, you can enable inventory tracking if needed.
#### Why isn’t my price updating on the product page?
Make sure:
* You added the **Dynamic Bundle Price** block
* You removed or hid the default Price block
* Your Option Set is saved
